Here is the full list of all 26 SUPERHOT achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Beat all Challenges.
Get RED ending in every level of SPEEDRUN challenge.
Get RED ending in every level of SPEEDRUNrt challenge.
Kill over 1987 Red Dudes in endless mode.
Unlock all endless levels.
Kill 100 Red Dudes with a shotgun.
Kill 100 Red Dudes with a rifle.
Kill 100 Red Dudes with a katana.
Launch every app in the system.
Cut bullet with a katana.
Kill 3 Red Dudes with one shotgun shot.
Score 100 headshots.
Kill 2 Red Dudes with one katana throw.
Find all secrets.
Become part of the community.
Complete the game.
Get back to the system after being expelled.
Kill 100 Red Dudes using melee.
Kill an enemy by jumping on him.
Kill 100 Red Dudes with a pistol.
Complete SERV level.
Kill 3 Red Dudes with one rifle burst.
Complete SUBWAY level.
Upload a replay on killstagram.com
Shoot down a bullet with a bullet.